CN106713210A - Method for implementing anti-interference unmanned aerial vehicle data link - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention provides a method for implementing an anti-interference unmanned aerial vehicle data link, which comprises two steps of: transmitting data on the ground; and receiving the data by an unmanned aerial vehicle. Information modulated by a BPSK base band is subjected to frequency hopping selection by utilizing a PN code, and the information obtained after frequency hopping selection is subjected to OFDM (Orthogonal Frequency Division Multiplexing) modulation by utilizing IFFT (Inverse Fast Fourier Transform), thereby effectively reducing complexity of system implementation and benefiting for implementing a digital efficient unmanned aerial vehicle data link anti-interference system. Meanwhile, the method solves the problems that in a conventional frequency hopping system, a frequency hopping rate is low, the number of frequency points is fixed and difficult to change, equipment is complex, and anti-interference capacity for interference, such as narrow-band interference, broadband disturbance, broadband noise and the like, is insufficient.
Description
Technical field
The invention belongs to wireless communication technology field, and in particular to a kind of implementation method of anti-interference Unmanned Aerial Vehicle Data Link.
Background technology
Unmanned Aerial Vehicle Data Link be connection unmanned plane and other aircraft between, between unmanned plane and carrier-borne maneuvering platform, with
And between unmanned plane and ground control commanding, equipment resource-sharing information bridge.Interference is to cause Unmanned Aerial Vehicle Data Link
The principal element of thrashing, is also Main Means that enemy harms our unmanned plane.As unmanned plane is militarily played
Effect is increasingly apparent, and the interference free performance to its Data-Link it is also proposed more requirements, wherein weakening what Data-Link was faced
The influence of the interference such as arrowband interference, broadband interference, broadband noise is particularly important.Current UAV Data-Links realize jamproof key
Technology has direct sequence spread spectrum skill (DSSS), frequency hop spread spectrum (FHSS) etc..Wherein DSSS technologies by information code element and
High speed pseudo-code is multiplied to expand the bandwidth of signal to improve interference free performance, but the technology is while interference free performance is lifted
Reduce the utilization rate of frequency spectrum；FHSS technologies are the saltus steps by signal on different frequencies realizes the exhibition of signal band
Width, but frequency hopping points increase the complexity that can increase system.
Document " Studies on Novel Anti-jamming Technique of Unmanned Aerial
Vehicle Data Link [J] .Chinese Journal of Aeronautics, 2008 " spread by DS, multi-system,
OFDM (OFDM) proposes orthogonal code time-division multi sub-channel spread spectrum modulation (OC-TDMSCSSM), to improve unmanned plane number
Laid a good foundation according to chain interference free performance.But because the frequency of the method frequency hopping selection is fixed, it is unfavorable for that increasing frequency hopping points comes
System processing gain is improved, the complexity of simultaneity factor global design is higher, accordingly, it is difficult to the unmanned plane in reaching battlefield surroundings
The anti-interference requirement of Data-Link.
The content of the invention
In order to solve the interference performances such as the anti-arrowband interference of existing Unmanned Aerial Vehicle Data catenary system, broadband interference, broadband noise not
The problem of foot, the present invention proposes a kind of implementation method of anti-interference Unmanned Aerial Vehicle Data Link.Using in OFDM (OFDM)
IFFT (inverse FFT) and FFT (FFT), and frequency hopping is carried out on its basis, improve frequency hopping speed
Rate, at the same also cause frequency number no longer fix, finally realize Unmanned Aerial Vehicle Data Link effectively resist arrowband interference, broadband interference,
The influence of the interference such as broadband noise.
A kind of implementation method of anti-interference Unmanned Aerial Vehicle Data Link, it is characterised in that step is as follows：
Step one：Ground launch data, specially：
Step 1：Transmitting terminal carries out convolutional encoding to source information, obtains the information after convolutional encoding, then to convolutional encoding after
Information be interleaved, the information after being interweaved；
Step 2：Information after the intertexture obtained to step 1 carries out DSSS and multi-system spread processing, obtains
Information after spread spectrum；
Step 3：Serioparallel exchange and BPSK baseband modulations are carried out to the information after spread spectrum, the letter after BPSK baseband modulations is obtained
Breath, then, orthogonal spread-spectrum codes is selected according to the information after modulation, and builds matrix A, wherein, selected by a wherein behavior of matrix
The orthogonal spread-spectrum codes selected, remaining row is 0, and orthogonal spread-spectrum codes to be expert at and randomly select determination by PN yards；
Step 4：The matrix obtained to step 3 using IFFT carries out OFDM modulation, obtains the information after OFDM modulation；
Step 5：Information after being modulated to OFDM carries out parallel-serial conversion and carrier modulation, obtains transmission signal, and by day
Line is launched, and completes data is activation；
Step 2：Unmanned plane receives data, specially：
Step 1：After receiving terminal antenna receives signal, carrier wave demodulation is carried out to the signal after reception, after being demodulated
Signal；
Step 2：Serioparallel exchange is carried out to the signal after carrier wave demodulation, matrix A ' is obtained；
Step 3：OFDM demodulation is carried out to matrix A ' using FFT, the information after OFDM demodulation is obtained；
Step 4：According to the corresponding row in the information after PN yards of selection OFDM demodulation, and BPSK demodulation is carried out, obtain BPSK
Information after demodulation；
Step 5：The peak maximum of the information after orthogonal Sexual behavior mode BPSK demodulation according to orthogonal spread-spectrum codes, and carry out many
System despreading, obtains the information after multi-system despreading；
Step 6：Parallel-serial conversion and DSSS despreading are carried out to the information after multi-system despreading, is obtained directly
Information after sequence spread spectrum despreading；
Step 7：Information after being de-spread to DSSS is deinterleaved, the information after being deinterleaved；
Step 8：Folding coding is carried out to the information after deinterleaving, launched source information is obtained.
The beneficial effects of the invention are as follows：Frequency hopping selection is carried out to the information after BPSK baseband modulations by using PN yards, and
Information after being selected frequency hopping using IFFT carries out OFDM modulation, anti-with the Unmanned Aerial Vehicle Data Link that existing spread spectrum and OFDM are combined dry
The method of disturbing is compared, and significantly reduces the complexity of system realization, is advantageously implemented digitized efficient Unmanned Aerial Vehicle Data Link and is resisted
EVAC.Meanwhile, it is complicated also to solve that frequency hopping rate in traditional frequency-hopping system is slow, frequency number fixes not malleable, equipment
And the problem not enough to the antijamming capability of the interference such as arrowband interference, broadband interference, broadband noise.
Brief description of the drawings
Fig. 1 is a kind of basic flow sheet of anti-interference Unmanned Aerial Vehicle Data Link implementation method of the invention.
Fig. 2 is the Data-Link transmitting schematic diagram data of the inventive method.
Fig. 3 is that the Data-Link of the inventive method receives schematic diagram data.
Fig. 4 is using bit error rate distribution curve design sketch of the inventive method under broadband interference.
Fig. 5 is the bit error rate distribution curve design sketch under arrowband interference using the inventive method.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples, and the present invention includes but are not limited to following implementations
Example.
A kind of anti-interference Unmanned Aerial Vehicle Data Link implementation method of the invention, its basic flow sheet is as shown in figure 1, its Data-Link
Transmitting data and reception schematic diagram data as shown in Figures 2 and 3, specifically include following steps respectively：
Step one：Ground launch data, specially：
Step 1：Transmitting terminal carries out convolutional encoding to source information, obtains the information after convolutional encoding, then to convolutional encoding after
Information be interleaved, the information after being interweaved；
Step 2：Information after the intertexture obtained to step 1 carries out DSSS and multi-system spread processing, obtains
Information after spread spectrum；
Step 3：Serioparallel exchange and BPSK baseband modulations are carried out to the information after spread spectrum, the letter after BPSK baseband modulations is obtained
Breath, then, orthogonal spread-spectrum codes is selected according to the information after modulation, and builds matrix A, wherein, selected by a wherein behavior of matrix
The orthogonal spread-spectrum codes selected, remaining row is 0, and orthogonal spread-spectrum codes to be expert at and randomly select determination by PN yards；
Step 4：The matrix obtained to step 3 using IFFT (inverse FFT) carries out OFDM (orthogonal frequency division multiplexings
With) modulation, obtain the information after OFDM modulation；
Step 5：Information after being modulated to OFDM carries out parallel-serial conversion and carrier modulation, obtains transmission signal, and by day
Line is launched, and completes data is activation；
Step 2：Unmanned plane receives data, specially：
Step 1：After receiving terminal antenna receives signal, carrier wave demodulation is carried out to the signal after reception, after being demodulated
Signal；
Step 2：Serioparallel exchange is carried out to the signal after carrier wave demodulation, matrix A ' is obtained；
Step 3：OFDM demodulation is carried out to matrix A ' using FFT (FFT), the letter after OFDM demodulation is obtained
Breath；
Step 4：According to the corresponding row in the information after PN yards of selection OFDM demodulation, and BPSK demodulation is carried out, obtain BPSK
Information after demodulation；
Step 5：The peak maximum of the information after orthogonal Sexual behavior mode BPSK demodulation according to orthogonal spread-spectrum codes, and carry out many
System despreading, obtains the information after multi-system despreading；
Step 6：Parallel-serial conversion and DSSS despreading are carried out to the information after multi-system despreading, is obtained directly
Information after sequence spread spectrum despreading；
Step 7：Information after being de-spread to DSSS is deinterleaved, the information after being deinterleaved；
Step 8：Folding coding is carried out to the information after deinterleaving, launched source information is obtained.
The present embodiment simulation parameter sets such as table 1.The inventive method and tradition OC- are carried out under Matlab environment
TDMSCSSM (modulation of orthogonal code time-division multi sub-channel spread spectrum) method is emulated, and introduces broadband interference and arrowband interference respectively, its
In, the ber curve distribution under the influence of broadband interference is as shown in figure 4, ber curve distribution is as schemed under arrowband interference effect
Shown in 5.As can be seen that under broadband interference, when the bit error rate is 10-5When, the same OC- of interference free performance of the inventive method
TDMSCSSM methods are compared and improve 1dB or so；Under arrowband interference, when the bit error rate is 10-5When, the inventive method it is anti-interference
Performance improves 1.5dB or so compared with OC-TDMSCSSM methods.
Table 1
Claims (1)
1. a kind of implementation method of anti-interference Unmanned Aerial Vehicle Data Link, it is characterised in that step is as follows：
Step one：Ground launch data, specially：
Step 1：Transmitting terminal carries out convolutional encoding to source information, obtains the information after convolutional encoding, then to the letter after convolutional encoding
Breath is interleaved, the information after being interweaved；
Step 2：Information after the intertexture obtained to step 1 carries out DSSS and multi-system spread processing, is spread
Information afterwards；
Step 3：Serioparallel exchange and BPSK baseband modulations are carried out to the information after spread spectrum, the information after BPSK baseband modulations is obtained,
Then, orthogonal spread-spectrum codes are selected according to the information after modulation, and builds matrix A, wherein, a wherein behavior of matrix is selected
Orthogonal spread-spectrum codes, remaining row is 0, and orthogonal spread-spectrum codes to be expert at and randomly select determination by PN yards；
Step 4：The matrix obtained to step 3 using IFFT carries out OFDM modulation, obtains the information after OFDM modulation；
Step 5：Information after being modulated to OFDM carries out parallel-serial conversion and carrier modulation, obtains transmission signal, and send out by antenna
It is shot out, completes data is activation；
Step 2：Unmanned plane receives data, specially：
Step 1：After receiving terminal antenna receives signal, carrier wave demodulation is carried out to the signal after reception, the signal after being demodulated；
Step 2：Serioparallel exchange is carried out to the signal after carrier wave demodulation, matrix A ' is obtained；
Step 3：OFDM demodulation is carried out to matrix A ' using FFT, the information after OFDM demodulation is obtained；
Step 4：According to the corresponding row in the information after PN yards of selection OFDM demodulation, and BPSK demodulation is carried out, obtain BPSK demodulation
Information afterwards；
Step 5：The peak maximum of the information after orthogonal Sexual behavior mode BPSK demodulation according to orthogonal spread-spectrum codes, and carry out multi-system
Despreading, obtains the information after multi-system despreading；
Step 6：Parallel-serial conversion and DSSS despreading are carried out to the information after multi-system despreading, direct sequence is obtained
Information after despreading；
Step 7：Information after being de-spread to DSSS is deinterleaved, the information after being deinterleaved；
Step 8：Folding coding is carried out to the information after deinterleaving, launched source information is obtained.
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Cited By (5)
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| CN107391641A (en) * | 2017-07-11 | 2017-11-24 | 北京航空航天大学 | A kind of anti-interference data management system of civilian Unmanned Aerial Vehicle Data Link |
| CN107563011A (en) * | 2017-08-08 | 2018-01-09 | 西北工业大学 | A kind of Design of Simulation System method of Unmanned Aerial Vehicle Data Link reliability |
| CN108712206A (en) * | 2018-05-28 | 2018-10-26 | 广东容祺智能科技有限公司 | A kind of more wave frequencies synchronization transceiver system and communication means based on unmanned plane |
| CN109309541A (en) * | 2018-10-10 | 2019-02-05 | 西北工业大学 | One kind being based on the jamproof half physical varification system of Unmanned Aerial Vehicle Data Link and verification method |
| CN112235224A (en) * | 2020-10-12 | 2021-01-15 | 电子科技大学 | Link 16-based enhanced data Link transmission waveform design method |
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| CN109309541A (en) * | 2018-10-10 | 2019-02-05 | 西北工业大学 | One kind being based on the jamproof half physical varification system of Unmanned Aerial Vehicle Data Link and verification method |
| CN109309541B (en) * | 2018-10-10 | 2021-04-02 | 西北工业大学 | Unmanned aerial vehicle data chain anti-interference-based semi-physical verification system and verification method |
| CN112235224A (en) * | 2020-10-12 | 2021-01-15 | 电子科技大学 | Link 16-based enhanced data Link transmission waveform design method |
| CN112235224B (en) * | 2020-10-12 | 2021-08-03 | 电子科技大学 | Link 16-based enhanced data Link transmission waveform design method |
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